In which of the following activities silicon carbide is used?

In which of the following activities silicon carbide is used?

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1) Most soluble in water is

2) According to Avogadro's Hypothesis, the smallest particle of an element or a compound, that can exist independently, is called ____ .

3) The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is

4) The element common to all acids is

5) The wavelength of X-rays is of the order of